What your likely seeing is what is called "drift". For a backcast to work well, you still have to stop the rod at a point when the trajectory of the tip is upward to flat, not down. After that, one can "drift" the rod back further to a starting point further back so one can produce a longer, more powerful forward casting stroke.
Fly rod Drifting
This guy stops way lower than is practical while fishing, but you can see him stop at an angle, and drift to horizontal-